Caffeine-induced sleep disorder is a psychiatric disorder that results from overconsumption of the stimulant caffeine. The specific criteria for this disorder in the fourth axis of the Diagnostic and Statistical Manual of Mental Disorders include that there must be a significant inability to sleep which is caused entirely by the physiological effects of caffeine as proven by an examination; if sleeping issues can be accounted for due to a breathing-related sleep disorder, narcolepsy, or another mental disorder, then caffeine-induced sleeping disorder is not the cause. This condition causes a notable impairment in functioning in sufferers.[1]